fix a little stuff around intro section closing

Author: JoshuaKGoldberg

src/steps/writeReadme/findIntroSectionClose.test.ts

@@ -40,7 +40,7 @@ describe("findIntroSectionClose", () => {
 
 Next line.
 `,
-			13,
+			14,
 		],
 	])("%s", (contents, expected) => {
 		expect(findIntroSectionClose(contents)).toEqual(expected);

src/steps/writeReadme/findIntroSectionClose.ts

@@ -18,5 +18,5 @@ export function findIntroSectionClose(contents: string) {
 	}
 
 	// Lastly, go for the second line altogether
-	return contents.indexOf("\n", 2);
+	return contents.indexOf("\n", 1) + 1;
 }

src/steps/writeReadme/index.test.ts

@@ -130,7 +130,7 @@ describe("writeReadme", () => {
 	});
 
 	it("adds sections when the README.md already exists and is sparse", async () => {
-		mockReadFileSafe.mockResolvedValueOnce(`# ${options.title}`);
+		mockReadFileSafe.mockResolvedValueOnce(`# ${options.title}\n`);
 
 		await writeReadme(options);
 
@@ -173,7 +173,7 @@ describe("writeReadme", () => {
 			\`\`\`
 			\`\`\`ts
 			import { greet } from \\"test-repository\\";
-			\`\`\`e
+			\`\`\`
 
 			## Contributors
 			<!-- spellchecker: disable -->
@@ -199,7 +199,7 @@ describe("writeReadme", () => {
 	});
 
 	it("adds all-contributors content when directed to and the indicator does not yet exist", async () => {
-		mockReadFileSafe.mockResolvedValueOnce(`# ${options.title}`);
+		mockReadFileSafe.mockResolvedValueOnce(`# ${options.title}\n`);
 
 		await writeReadme({
 			...options,
@@ -245,7 +245,7 @@ describe("writeReadme", () => {
 			\`\`\`
 			\`\`\`ts
 			import { greet } from \\"test-repository\\";
-			\`\`\`e
+			\`\`\`
 
 			## Contributors
 			<!-- spellchecker: disable -->